The correct answer is to use Microsoft Defender for Endpoint to initiate device isolation. This is because Defender for Endpoint, as a core component of Microsoft Defender XDR, is specifically designed for endpoint-level security actions, including the immediate network isolation of a compromised device to contain ransomware spread. On the SC-900 exam, this question tests your understanding of which Microsoft security tool handles real-time endpoint response versus other services like Sentinel (SIEM), Intune (MDM), or Entra ID (identity). A common trap is confusing Intune’s device wipe, which is slower and not designed for urgent containment, with Defender for Endpoint’s instant isolation feature. Remember the memory tip: for immediate network cut-off, think “Defender isolates, Intune wipes.”
SC-900 Practice Question: Describe the capabilities of Microsoft security solutions
This SC-900 practice question tests your understanding of describe the capabilities of microsoft security solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A security analyst in your organization receives an alert from Microsoft Defender XDR indicating that a user's device may be infected with ransomware. The analyst needs to immediately isolate the device from the network to prevent further spread. What should the analyst do?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Microsoft Defender for Endpoint to initiate device isolation
Option B is correct because Microsoft Defender for Endpoint (part of Defender XDR) provides the ability to isolate a device from the network. Option A is wrong because Microsoft Sentinel is SIEM, not endpoint action. Option C is wrong because Microsoft Intune can wipe devices but is slower and not immediate isolation. Option D is wrong because Microsoft Entra ID is for identity, not device isolation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Revoke the user's session in Microsoft Entra ID
Why it's wrong here
Revoking session does not isolate the device.
✓
Use Microsoft Defender for Endpoint to initiate device isolation
Why this is correct
Defender for Endpoint allows immediate isolation of the device.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Open Microsoft Sentinel and run a playbook
Why it's wrong here
Sentinel can automate but immediate isolation is better via endpoint action.
✗
Use Microsoft Intune to wipe the device
Why it's wrong here
Wiping is more severe and not immediate isolation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-900 question in full detail.
Identify which SC-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Describe the capabilities of Microsoft security solutions — This question tests Describe the capabilities of Microsoft security solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Microsoft Defender for Endpoint to initiate device isolation — Option B is correct because Microsoft Defender for Endpoint (part of Defender XDR) provides the ability to isolate a device from the network. Option A is wrong because Microsoft Sentinel is SIEM, not endpoint action. Option C is wrong because Microsoft Intune can wipe devices but is slower and not immediate isolation. Option D is wrong because Microsoft Entra ID is for identity, not device isolation.
What should I do if I get this SC-900 question wrong?
Identify which SC-900 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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